Battery liquid cooling structure

Abstract

This utility model provides a battery liquid cooling structure, including a liquid cooling channel plate configured as a sunken tank structure with planar fins formed at the edge of the tank. The tank has symmetrically arranged inlet and outlet turbulence sections in its center, each with raised turbulence points. The bottom of each inlet and outlet turbulence section has a corresponding liquid inlet and outlet. A liquid cooling plate base is located near the planar fins on the surface of the tank's center, and a first rectangular through-slot is formed in the center of the base. A side liquid cooling plate has inlet and outlet channels penetrating its upper and lower ends. One end of a flow channel conversion sealing strip has two horizontally arranged second rectangular through-slots. One end of the side liquid cooling plate is connected to the first rectangular through-slot, and the other end is connected to the second rectangular through-slot of the flow channel conversion sealing strip. The combination of the liquid cooling channel plate and the side cooling plate improves the cooling efficiency of the battery pack and reduces the temperature difference between different cells within the battery pack.

Description

Technical Field

[0001] This utility model relates to the field of power battery technology, and in particular to a battery liquid cooling structure. Background Technology

[0002] Currently, lithium battery thermal management systems on the market mainly employ two methods: air cooling and liquid cooling. Traditional air cooling is simple and convenient, but its cooling surface has a small heat transfer coefficient and low heat transfer efficiency, making it difficult to meet the requirements of rapid heat dissipation. Liquid cooling involves placing coolant outside the battery module, but typically a liquid cooling plate is placed at the bottom of the battery pack for cooling. The coolant flow channel of the liquid cooling plate uses a serpentine pipe with one inlet and one outlet, but its heat exchange area is small, the contact thermal resistance between the battery pack and the liquid cooling plate is large, and the heat transfer efficiency is low, making bottom cooling ineffective. Utility Model Content

[0003] To address the shortcomings of existing technologies, this utility model provides a battery liquid cooling structure to solve the technical problem that the liquid cooling plate uses a serpentine pipe with one inlet and one outlet, but its heat exchange area is small, the contact thermal resistance between the battery pack and the liquid cooling plate is large, the heat transfer efficiency is low, and the bottom cooling method is not effective.

[0004] This utility model provides a battery liquid cooling structure, including:

[0005] Liquid-cooled flow channel plate, liquid-cooled plate base, side liquid-cooled plate, and flow channel conversion sealing strip;

[0006] The liquid-cooled flow channel plate is designed as a sunken tank structure, with planar fins formed on the edge of the tank. The middle part of the tank is symmetrically provided with an inlet turbulence section and an outlet turbulence section. Both the inlet turbulence section and the outlet turbulence section are provided with raised turbulence points, and the bottom of the inlet turbulence section and the outlet turbulence section are respectively provided with corresponding liquid inlet and liquid outlet connected to each other.

[0007] The liquid cooling plate base is located on the periphery of the central surface of the tank near the planar fins, and a first rectangular through groove is provided in the central part of the liquid cooling plate base; the side liquid cooling plate is provided with an inlet flow channel and an outlet flow channel that penetrate through its upper and lower ends; one end of the flow channel conversion sealing strip is provided with two horizontally arranged second rectangular through grooves.

[0008] One end of the side liquid cooling plate is connected to the first rectangular through groove, and the other end is connected to the second rectangular through groove of the flow channel conversion sealing strip.

[0009] Optionally, the tank body has symmetrically arranged inlet and outlet turbulence sections in the middle, each inlet and outlet turbulence section having raised turbulence points, including:

[0010] The tank is provided with 4 sets of inlet turbulence sections and 4 sets of outlet turbulence sections. The inlet turbulence section and the outlet turbulence section are each arranged horizontally with two turbulence points and three turbulence points respectively.

[0011] Optionally, the liquid-cooled plate base includes:

[0012] Its thickness is 5-6mm, and the flatness of the upper and lower surfaces of the liquid cooling plate base is controlled to be 0-0.3mm.

[0013] Optionally, both the inlet and outlet channels are designed as harmonica tubes.

[0014] Optionally, the width of the second rectangular channel is 1 / 4 of the width of the inlet channel and the outlet channel.

[0015] Optionally, the planar fin includes:

[0016] Its width is 5-8mm.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] By combining the liquid-cooled flow channel plate at the bottom of the battery module with the side cooling plates, the heat exchange area of ​​the battery pack is increased, improving the cooling efficiency and reducing the temperature difference between different cells while lowering the overall temperature of the battery pack. The liquid-cooled plate base and the liquid-cooled flow channel plate are brazed together. The liquid-cooled flow channel plate is divided into symmetrical inlet and outlet flow sections in the width direction, with inlet and outlet water pipes connected to it by brazing. Multiple flow points are distributed on the flow sections, forming a tortuous liquid-cooled flow channel within the liquid-cooled plate to ensure the uniformity of the liquid cooling system's flow rate. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall exploded structure of this utility model;

[0020] Figure 2 This is a schematic diagram of the side liquid cooling plate structure in this utility model;

[0021] Figure 3 This is a bottom view of the flow channel conversion sealing strip of this utility model;

[0022] Figure 4 This is a top view of the flow channel conversion sealing strip of this utility model;

[0023] Figure 5 This is a schematic diagram of the liquid cooling circuit in this utility model.

[0024] Explanation of icon numbers:

[0025] 1. Liquid-cooled flow channel plate; 101. Tank body; 102. Flat fins; 103. Inlet turbulence section; 104. Outlet turbulence section; 105. Turbulence point; 106. Liquid inlet; 107. Liquid outlet; 2. Liquid-cooled plate base; 201. First rectangular through groove; 3. Side liquid-cooled plate; 301. Inlet flow channel; 302. Outlet flow channel; 4. Flow channel conversion sealing strip; 401. Second rectangular flow channel; 402. Countersunk screw hole.

[0026] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0027] To make the objectives, technical solutions, and beneficial effects of this utility model clearer, the technical solutions of this utility model are further described below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of this utility model and are not intended to limit it.

[0028] See Figure 1 and Figure 2 This utility model provides a battery liquid cooling structure, comprising:

[0029] Liquid-cooled flow channel plate 1, liquid-cooled plate base 2, side liquid-cooled plate 3, and flow channel conversion sealing strip 4;

[0030] The liquid-cooled flow channel plate 1 is configured as a sunken tank 101 structure. The edge of the tank 101 forms planar fins 102. The middle of the tank 101 is symmetrically provided with an inlet turbulence section 103 and an outlet turbulence section 104. Both the inlet turbulence section 103 and the outlet turbulence section 104 are provided with protruding turbulence points 105. The bottom of the inlet turbulence section 103 and the outlet turbulence section 104 are respectively provided with corresponding liquid inlets 106 and liquid outlets 107.

[0031] The liquid cooling plate base 2 is located on the periphery of the central surface of the tank 101 near the planar fins 102, and a first rectangular through groove 201 is provided in the central part of the liquid cooling plate base 2; the side liquid cooling plate 3 is provided with an inlet channel 301 and an outlet channel 302 that pass through its upper and lower ends; one end of the channel conversion sealing strip 4 is provided with two horizontally arranged second rectangular through grooves 401;

[0032] One end of the side liquid cooling plate 3 is connected to the first rectangular through groove 201, and the other end is connected to the second rectangular through groove 401 of the flow channel conversion sealing strip 4.

[0033] See Figure 1In this embodiment, the main body of the liquid-cooled flow channel plate 1 is an integral "U"-shaped structure. The whole adopts a sunken tank 101 structure, and the edge naturally forms a planar fin 102. After being welded to the liquid-cooled plate base 2, it forms a flow channel inlet and outlet loop. A flow bypass point is provided between the inlet turbulence part 103 and the outlet turbulence part 104. The flow bypass point is connected to the liquid-cooled plate base 2 by brazing, which further strengthens the overall structural strength and stability of the liquid-cooled plate and further ensures the flatness of the liquid-cooled plate.

[0034] By combining the liquid-cooled flow channel plate 1 at the bottom of the battery module with the side cooling plate, the heat exchange area of ​​the battery pack is increased, improving the cooling efficiency of the battery pack and reducing the temperature difference between different cells while lowering the overall temperature of the battery pack. The liquid-cooled plate base 2 and the liquid-cooled flow channel plate 1 are fixed together by brazing. The liquid-cooled flow channel plate 1 is divided into symmetrical inlet and outlet flow channels in the width direction, with inlet pipe 106 and outlet pipe 107 respectively connected by brazing. Multiple flow points are distributed on the flow channels, forming a tortuous liquid-cooled flow channel within the liquid-cooled plate to ensure the uniformity of the liquid cooling system flow.

[0035] See Figure 1 In another embodiment, the tank 101 has an inlet turbulence section 103 and an outlet turbulence section 104 symmetrically arranged in the middle. Both the inlet turbulence section 103 and the outlet turbulence section 104 are provided with raised turbulence points 105, including:

[0036] The tank 101 is provided with 4 sets of inlet turbulence sections 103 and 4 sets of outlet turbulence sections 104. The inlet turbulence section 103 and the outlet turbulence section 104 are both horizontally spaced with two turbulence points 105 and three turbulence points 105, respectively.

[0037] The battery module has four sets of inlet flow sections and four sets of outlet flow sections at the bottom using a "U"-shaped structure. Each flow section has multiple raised flow points to ensure that the coolant flows evenly in the flow channel.

[0038] In another embodiment, the liquid-cooled plate base 2 includes:

[0039] Its thickness is 5-6mm, and the flatness of the upper and lower surfaces of the liquid cooling plate base 2 is controlled to be 0-0.3mm.

[0040] The liquid cooling plate base 2 has a planar structure with a thickness of 5-6mm. The flatness of the upper and lower surfaces is controlled to be 0-0.3mm. While supporting the weight of the battery pack, the upper surface improves the cooling efficiency of the liquid cooling plate for the battery pack. The lower surface is in close contact with the edge fins of the flow channel plate and the plane of the flow point. The base plate adopts a rounded corner structure to improve the assembly efficiency of the liquid cooling plate and the battery pack housing. The middle plane of the liquid cooling plate base 2 is provided with 3 rectangular through slots. The upper surface of the slots is provided with a right-angle structure of equal length around the perimeter to improve the assembly efficiency and assembly accuracy of the side liquid cooling plate 33.

[0041] See Figure 2 In another embodiment, both the inlet channel 301 and the outlet channel 302 are designed as harmonica tubes.

[0042] The side liquid cooling plate 3 is a rectangular harmonica tube type liquid cooling plate. Each side liquid cooling plate 3 has an inlet flow channel 301 on the left and an outlet flow channel 302 on the right, which are composed of multiple rectangular through slots. This increases the heat exchange area for side cooling of the battery module, improves the cooling efficiency of the battery pack, and reduces the temperature difference between the battery cells. The protruding part of the harmonica tube at the bottom of the side liquid cooling plate 3 is the same size as the rectangular slot of the liquid cooling plate base 2, and the height is the same as the thickness of the liquid cooling plate base 2. The side liquid cooling plate 3 is inserted directly into the liquid cooling plate base 2 and connected by brazing. The side liquid cooling plate 3 has arc-shaped structures on both sides. The lower part can further ensure the assembly reliability of the side liquid cooling plate 3 and the liquid cooling plate base 2. The upper part has screw holes and is connected to the flow channel conversion sealing strip 4 by screw connection, which changes the flow direction of the coolant from the planar direction to the vertical direction, forming a complete liquid cooling circuit.

[0043] In another embodiment, the width of the second rectangular through-slot 401 is 1 / 4 of the width of the inlet channel 301 and the outlet channel 302.

[0044] See Figure 3 and Figure 4 First, the flow channel conversion sealing strip 4 has a similar shape and structure to the side liquid cooling plate 3. It has two rectangular grooves at the bottom to divide the coolant from each inlet pipe on the side liquid cooling plate 3 into two paths. The width of the two grooves is 1 / 4 the width of the harmonica tube, ensuring that the coolant in the inlet flow channel 301 of the side liquid cooling plate 3 can be evenly distributed into the outlet pipe, forming a complete cooling circuit. This reduces the pressure drop and flow resistance of the coolant in the liquid cooling system, improving the cooling efficiency of the battery pack. The bottom is sealed and fixed to the side liquid cooling plate 3 by brazing to prevent coolant overflow and battery pack failure, improving the overall electrical safety of the battery pack. Screw holes are provided on both sides of the sealing strip for fixing to the side liquid cooling plate 3 with screws, further increasing the structural strength and stability of the liquid cooling system. A countersunk screw hole 402 is provided in the middle of the sealing strip for fixing to the battery module bracket, further strengthening the structural stability of the battery pack and improving the safety of the battery pack system.

[0045] In another embodiment, the planar fin 102 includes:

[0046] Its width is 5-8mm.

[0047] The width of the planar fin 102 is 5-8mm, which improves the overall support strength of the liquid-cooled flow channel plate 1 while ensuring the stability of the welded structure.

[0048] See Figure 5 This invention increases the heat exchange area of ​​the battery pack and improves its cooling efficiency by combining the bottom liquid-cooled flow channel plate 1 and the side cooling plates of the battery module. This reduces the temperature difference between different cells in the battery pack while lowering the overall temperature of the battery pack. The bottom liquid-cooled flow channel plate 1 and three side liquid-cooled plates 3 are connected by brazing and form a side liquid-cooling circuit via a flow channel conversion sealing strip 4. The liquid cooling system adopts a 1-in-1-out liquid cooling structure. After flowing through the bottom liquid-cooled flow channel plate 1, three parallel side liquid-cooling circuits are formed inside. Simultaneously, the bottom liquid-cooled flow channel plate 1 has a circuit at its "U"-shaped bottom to reduce the flow resistance of the coolant in the third side liquid-cooling circuit and reduce the pressure drop of the liquid cooling system.

[0049] The bottom liquid cooling plate is fixed to the base plate and the flow channel plate by brazing. The flow channel plate is divided into symmetrical inlet and outlet flow sections in the width direction, with inlet pipe 106 and outlet pipe 107 respectively connected by brazing. Multiple flow points are distributed on the flow sections, forming a tortuous liquid cooling channel within the liquid cooling flow channel plate 1, ensuring the uniformity of the liquid cooling system flow. Furthermore, the three side liquid cooling plates 3 adopt a harmonica tube structure, which is fixed to the flow channel conversion sealing strip 4 by brazing and screw connections, forming a complete side liquid cooling circuit. This also prevents coolant overflow and improves the overall electrical safety of the battery pack. This structural design meets the requirements of lightweight battery pack design and improves the overall energy density of the battery pack.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A battery liquid cooling structure, characterized in that, include: Liquid-cooled flow channel plate (1), liquid-cooled plate base (2), side liquid-cooled plate (3), and flow channel conversion sealing strip (4); The liquid-cooled flow channel plate (1) is configured as a sunken tank (101) structure. The edge of the tank (101) forms a planar fin (102). The middle part of the tank (101) is symmetrically provided with an inlet turbulence section (103) and an outlet turbulence section (104). Both the inlet turbulence section (103) and the outlet turbulence section (104) are provided with protruding turbulence points (105). The bottom of the inlet turbulence section (103) and the outlet turbulence section (104) are respectively provided with corresponding liquid inlets (106) and liquid outlets (107). The liquid cooling plate base (2) is located on the periphery of the central surface of the tank (101) near the planar fins (102), and a first rectangular through groove (201) is provided in the central part of the liquid cooling plate base (2); the side liquid cooling plate (3) is provided with an inlet flow channel (301) and an outlet flow channel (302) that run through its upper and lower ends; one end of the flow channel conversion sealing strip (4) is provided with two horizontally arranged second rectangular through grooves (401); One end of the side liquid cooling plate (3) is connected to the first rectangular through groove (201), and the other end is connected to the second rectangular through groove (401) of the flow channel conversion sealing strip (4).

2. The battery liquid cooling structure as described in claim 1, characterized in that, The tank (101) has an inlet turbulence section (103) and an outlet turbulence section (104) symmetrically arranged in the middle. Both the inlet turbulence section (103) and the outlet turbulence section (104) are provided with raised turbulence points (105), including: The tank (101) is provided with 4 sets of inlet turbulence sections (103) and 4 sets of outlet turbulence sections (104). The inlet turbulence section (103) and the outlet turbulence section (104) are both horizontally spaced with two turbulence points (105) and three turbulence points (105).

3. The battery liquid cooling structure as described in claim 2, characterized in that, The liquid-cooled plate base (2) includes: Its thickness is 5-6mm, and the flatness of the upper and lower surfaces of the liquid cooling plate base (2) is controlled to be 0-0.3mm.

4. The battery liquid cooling structure as described in claim 1, characterized in that, Both the inlet channel (301) and the outlet channel (302) are designed as harmonica tubes.

5. The battery liquid cooling structure as described in claim 1, characterized in that, The width of the second rectangular channel is 1 / 4 of the width of the inlet channel (301) and the outlet channel (302).

6. The battery liquid cooling structure as described in claim 1, characterized in that, The planar fin (102) includes: Its width is 5-8mm.

Images